Hmm, it's a tie for me I think. Don't often listen to things in album format to begin with, but since there are two that I always listen to in proper album format I guess those must be my favorite.

1. The first http://www.youtube.com/watch?v=OPCbX056rLI. There's something about it that's just candy to my ears. Lots of cool rhythms mixed with non-traditional sounds, so much so that every time I listen to the whole thing I find something new.

2. http://www.youtube.com/watch?v=W5KBeIpqqQo, a remix album of Cowboy Bebop songs. Every song is split up by this neat fake pirate radio broadcast from "very loose orbit around the martian planet".